http://findbugs.sourceforge.net/: Findbugs: Because it's easy! 
public class edu.umd.cs.findbugs.classfile.impl.ClassFactory implements edu.umd.cs.findbugs.classfile.IClassFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: edu.umd.cs.findbugs.classfile.impl.ClassFactory
  super_class: java.lang.Object
{
  private static edu.umd.cs.findbugs.classfile.IClassFactory theInstance;
    descriptor: Ledu/umd/cs/findbugs/classfile/IClassFactory;
    flags: (0x000a) ACC_PRIVATE, ACC_STATIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 43
            new edu.umd.cs.findbugs.classfile.impl.ClassFactory
            dup
            invokespecial edu.umd.cs.findbugs.classfile.impl.ClassFactory.<init>:()V
            putstatic edu.umd.cs.findbugs.classfile.impl.ClassFactory.theInstance:Ledu/umd/cs/findbugs/classfile/IClassFactory;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
         0: .line 45
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 46
            return
        end local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Ledu/umd/cs/findbugs/classfile/impl/ClassFactory;

  public static edu.umd.cs.findbugs.classfile.IClassFactory instance();
    descriptor: ()Ledu/umd/cs/findbugs/classfile/IClassFactory;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 49
            getstatic edu.umd.cs.findbugs.classfile.impl.ClassFactory.theInstance:Ledu/umd/cs/findbugs/classfile/IClassFactory;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public edu.umd.cs.findbugs.classfile.IClassPath createClassPath();
    descriptor: ()Ledu/umd/cs/findbugs/classfile/IClassPath;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
         0: .line 59
            new edu.umd.cs.findbugs.classfile.impl.ClassPathImpl
            dup
            invokespecial edu.umd.cs.findbugs.classfile.impl.ClassPathImpl.<init>:()V
            areturn
        end local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Ledu/umd/cs/findbugs/classfile/impl/ClassFactory;

  public edu.umd.cs.findbugs.classfile.IClassPathBuilder createClassPathBuilder(edu.umd.cs.findbugs.classfile.IErrorLogger);
    descriptor: (Ledu/umd/cs/findbugs/classfile/IErrorLogger;)Ledu/umd/cs/findbugs/classfile/IClassPathBuilder;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=2, args_size=2
        start local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
        start local 1 // edu.umd.cs.findbugs.classfile.IErrorLogger errorLogger
         0: .line 71
            new edu.umd.cs.findbugs.classfile.impl.ClassPathBuilder
            dup
            aload 0 /* this */
            aload 1 /* errorLogger */
            invokespecial edu.umd.cs.findbugs.classfile.impl.ClassPathBuilder.<init>:(Ledu/umd/cs/findbugs/classfile/IClassFactory;Ledu/umd/cs/findbugs/classfile/IErrorLogger;)V
            areturn
        end local 1 // edu.umd.cs.findbugs.classfile.IErrorLogger errorLogger
        end local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    1     0         this  Ledu/umd/cs/findbugs/classfile/impl/ClassFactory;
            0    1     1  errorLogger  Ledu/umd/cs/findbugs/classfile/IErrorLogger;
    MethodParameters:
             Name  Flags
      errorLogger  

  public edu.umd.cs.findbugs.classfile.ICodeBaseLocator createFilesystemCodeBaseLocator(java.lang.String);
    descriptor: (Ljava/lang/String;)Ledu/umd/cs/findbugs/classfile/ICodeBaseLocator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
        start local 1 // java.lang.String pathName
         0: .line 85
            new java.io.File
            dup
            aload 1 /* pathName */
            invokespecial java.io.File.<init>:(Ljava/lang/String;)V
            invokevirtual java.io.File.getCanonicalPath:()Ljava/lang/String;
            astore 1 /* pathName */
         1: .line 86
            goto 3
      StackMap locals:
      StackMap stack: java.io.IOException
         2: pop
         3: .line 90
      StackMap locals:
      StackMap stack:
            new edu.umd.cs.findbugs.classfile.impl.FilesystemCodeBaseLocator
            dup
            aload 1 /* pathName */
            invokespecial edu.umd.cs.findbugs.classfile.impl.FilesystemCodeBaseLocator.<init>:(Ljava/lang/String;)V
            areturn
        end local 1 // java.lang.String pathName
        end local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    4     0      this  Ledu/umd/cs/findbugs/classfile/impl/ClassFactory;
            0    4     1  pathName  Ljava/lang/String;
      Exception table:
        from    to  target  type
           0     1       2  Class java.io.IOException
    MethodParameters:
          Name  Flags
      pathName  

  public edu.umd.cs.findbugs.classfile.ICodeBaseLocator createNestedArchiveCodeBaseLocator(edu.umd.cs.findbugs.classfile.ICodeBase, java.lang.String);
    descriptor: (Ledu/umd/cs/findbugs/classfile/ICodeBase;Ljava/lang/String;)Ledu/umd/cs/findbugs/classfile/ICodeBaseLocator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
        start local 1 // edu.umd.cs.findbugs.classfile.ICodeBase parentCodeBase
        start local 2 // java.lang.String path
         0: .line 102
            new edu.umd.cs.findbugs.classfile.impl.NestedZipFileCodeBaseLocator
            dup
            aload 1 /* parentCodeBase */
            aload 2 /* path */
            invokespecial edu.umd.cs.findbugs.classfile.impl.NestedZipFileCodeBaseLocator.<init>:(Ledu/umd/cs/findbugs/classfile/ICodeBase;Ljava/lang/String;)V
            areturn
        end local 2 // java.lang.String path
        end local 1 // edu.umd.cs.findbugs.classfile.ICodeBase parentCodeBase
        end local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    1     0            this  Ledu/umd/cs/findbugs/classfile/impl/ClassFactory;
            0    1     1  parentCodeBase  Ledu/umd/cs/findbugs/classfile/ICodeBase;
            0    1     2            path  Ljava/lang/String;
    MethodParameters:
                Name  Flags
      parentCodeBase  
      path            

  static edu.umd.cs.findbugs.classfile.IScannableCodeBase createFilesystemCodeBase(edu.umd.cs.findbugs.classfile.impl.FilesystemCodeBaseLocator);
    descriptor: (Ledu/umd/cs/findbugs/classfile/impl/FilesystemCodeBaseLocator;)Ledu/umd/cs/findbugs/classfile/IScannableCodeBase;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=5, locals=3, args_size=1
        start local 0 // edu.umd.cs.findbugs.classfile.impl.FilesystemCodeBaseLocator codeBaseLocator
         0: .line 106
            aload 0 /* codeBaseLocator */
            invokevirtual edu.umd.cs.findbugs.classfile.impl.FilesystemCodeBaseLocator.getPathName:()Ljava/lang/String;
            astore 1 /* fileName */
        start local 1 // java.lang.String fileName
         1: .line 108
            new java.io.File
            dup
            aload 1 /* fileName */
            invokespecial java.io.File.<init>:(Ljava/lang/String;)V
            astore 2 /* file */
        start local 2 // java.io.File file
         2: .line 110
            aload 2 /* file */
            invokevirtual java.io.File.exists:()Z
            ifne 4
         3: .line 111
            new java.io.FileNotFoundException
            dup
            new java.lang.StringBuilder
            dup
            ldc "File "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* file */
            invokevirtual java.io.File.getAbsolutePath:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc " doesn't exist"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.io.FileNotFoundException.<init>:(Ljava/lang/String;)V
            athrow
         4: .line 112
      StackMap locals: java.lang.String java.io.File
      StackMap stack:
            aload 2 /* file */
            invokevirtual java.io.File.canRead:()Z
            ifne 6
         5: .line 113
            new java.io.IOException
            dup
            new java.lang.StringBuilder
            dup
            ldc "File "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* file */
            invokevirtual java.io.File.getAbsolutePath:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc " not readable"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.io.IOException.<init>:(Ljava/lang/String;)V
            athrow
         6: .line 114
      StackMap locals:
      StackMap stack:
            aload 2 /* file */
            invokevirtual java.io.File.isDirectory:()Z
            ifeq 8
         7: .line 115
            new edu.umd.cs.findbugs.classfile.impl.DirectoryCodeBase
            dup
            aload 0 /* codeBaseLocator */
            aload 2 /* file */
            invokespecial edu.umd.cs.findbugs.classfile.impl.DirectoryCodeBase.<init>:(Ledu/umd/cs/findbugs/classfile/ICodeBaseLocator;Ljava/io/File;)V
            areturn
         8: .line 116
      StackMap locals:
      StackMap stack:
            aload 2 /* file */
            invokevirtual java.io.File.isFile:()Z
            ifne 10
         9: .line 117
            new java.io.IOException
            dup
            new java.lang.StringBuilder
            dup
            ldc "File "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            aload 2 /* file */
            invokevirtual java.io.File.getAbsolutePath:()Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            ldc " is not a normal file"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.io.IOException.<init>:(Ljava/lang/String;)V
            athrow
        10: .line 118
      StackMap locals:
      StackMap stack:
            aload 1 /* fileName */
            ldc ".class"
            invokevirtual java.lang.String.endsWith:(Ljava/lang/String;)Z
            ifeq 12
        11: .line 119
            new edu.umd.cs.findbugs.classfile.impl.SingleFileCodeBase
            dup
            aload 0 /* codeBaseLocator */
            aload 1 /* fileName */
            invokespecial edu.umd.cs.findbugs.classfile.impl.SingleFileCodeBase.<init>:(Ledu/umd/cs/findbugs/classfile/ICodeBaseLocator;Ljava/lang/String;)V
            areturn
        12: .line 121
      StackMap locals:
      StackMap stack:
            aload 0 /* codeBaseLocator */
            aload 2 /* file */
            invokestatic edu.umd.cs.findbugs.classfile.impl.ZipCodeBaseFactory.makeZipCodeBase:(Ledu/umd/cs/findbugs/classfile/ICodeBaseLocator;Ljava/io/File;)Ledu/umd/cs/findbugs/classfile/impl/AbstractScannableCodeBase;
            areturn
        end local 2 // java.io.File file
        end local 1 // java.lang.String fileName
        end local 0 // edu.umd.cs.findbugs.classfile.impl.FilesystemCodeBaseLocator codeBaseLocator
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0   13     0  codeBaseLocator  Ledu/umd/cs/findbugs/classfile/impl/FilesystemCodeBaseLocator;
            1   13     1         fileName  Ljava/lang/String;
            2   13     2             file  Ljava/io/File;
    Exceptions:
      throws java.io.IOException
    MethodParameters:
                 Name  Flags
      codeBaseLocator  

  static edu.umd.cs.findbugs.classfile.IScannableCodeBase createNestedZipFileCodeBase(edu.umd.cs.findbugs.classfile.impl.NestedZipFileCodeBaseLocator);
    descriptor: (Ledu/umd/cs/findbugs/classfile/impl/NestedZipFileCodeBaseLocator;)Ledu/umd/cs/findbugs/classfile/IScannableCodeBase;
    flags: (0x0008) ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // edu.umd.cs.findbugs.classfile.impl.NestedZipFileCodeBaseLocator codeBaseLocator
         0: .line 127
            new edu.umd.cs.findbugs.classfile.impl.NestedZipFileCodeBase
            dup
            aload 0 /* codeBaseLocator */
            invokespecial edu.umd.cs.findbugs.classfile.impl.NestedZipFileCodeBase.<init>:(Ledu/umd/cs/findbugs/classfile/impl/NestedZipFileCodeBaseLocator;)V
            areturn
        end local 0 // edu.umd.cs.findbugs.classfile.impl.NestedZipFileCodeBaseLocator codeBaseLocator
      LocalVariableTable:
        Start  End  Slot             Name  Signature
            0    1     0  codeBaseLocator  Ledu/umd/cs/findbugs/classfile/impl/NestedZipFileCodeBaseLocator;
    Exceptions:
      throws edu.umd.cs.findbugs.classfile.ResourceNotFoundException, java.io.IOException
    MethodParameters:
                 Name  Flags
      codeBaseLocator  

  public edu.umd.cs.findbugs.classfile.IAnalysisCache createAnalysisCache(edu.umd.cs.findbugs.classfile.IClassPath, edu.umd.cs.findbugs.BugReporter);
    descriptor: (Ledu/umd/cs/findbugs/classfile/IClassPath;Ledu/umd/cs/findbugs/BugReporter;)Ledu/umd/cs/findbugs/classfile/IAnalysisCache;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=3
        start local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
        start local 1 // edu.umd.cs.findbugs.classfile.IClassPath classPath
        start local 2 // edu.umd.cs.findbugs.BugReporter errorLogger
         0: .line 139
            new edu.umd.cs.findbugs.classfile.impl.AnalysisCache
            dup
            aload 1 /* classPath */
            aload 2 /* errorLogger */
            invokespecial edu.umd.cs.findbugs.classfile.impl.AnalysisCache.<init>:(Ledu/umd/cs/findbugs/classfile/IClassPath;Ledu/umd/cs/findbugs/BugReporter;)V
            astore 3 /* analysisCache */
        start local 3 // edu.umd.cs.findbugs.classfile.IAnalysisCache analysisCache
         1: .line 140
            aload 3 /* analysisCache */
            areturn
        end local 3 // edu.umd.cs.findbugs.classfile.IAnalysisCache analysisCache
        end local 2 // edu.umd.cs.findbugs.BugReporter errorLogger
        end local 1 // edu.umd.cs.findbugs.classfile.IClassPath classPath
        end local 0 // edu.umd.cs.findbugs.classfile.impl.ClassFactory this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    2     0           this  Ledu/umd/cs/findbugs/classfile/impl/ClassFactory;
            0    2     1      classPath  Ledu/umd/cs/findbugs/classfile/IClassPath;
            0    2     2    errorLogger  Ledu/umd/cs/findbugs/BugReporter;
            1    2     3  analysisCache  Ledu/umd/cs/findbugs/classfile/IAnalysisCache;
    MethodParameters:
             Name  Flags
      classPath    
      errorLogger  
}
SourceFile: "ClassFactory.java"